Gait between a walk and a canter (4)
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I believe the answer is:
trot
'gait between a walk and a canter' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trot that I've seen before include "Horse's gait - extreme leftist" , "Hurry along" , "Jog along" , "Move at brisk pace" , "Run at moderate pace" .)